Abstract
Qalaa and Umum Drains are agricultural drains and they are the main water sources for Lake Mariut Main Basin (LMMB). The water of Qalaa Drains is anoxic all the time because it contains considerable quantity of oxygen-consuming matter due to the discharge of the wastewater of Alexandria East Wastewater Treatment Plant (EWTP). The present work is aiming to measuring the dissolved and particulate forms of the two major elements Mn and Fe, besides making an estimation of the redox potential of Qalaa and Umum Drains using Mn and Fe that can differentiate between the oxic water of Umum Drain and the anoxic water of Qalaa Drain. The oxidation of Qalaa Drain water is one of the solutions to remove the main Qalaa Drain problem which is H2S.
Highlights
The Lake Mariut Main Basin (LMMB) is the principle basin for fishing, sometimes is called Proper Lake Mariut
From all the selected stations, surface waters only were collected. 7 surface stations in Umum Drain and 8 surface stations covering the main course of Qalaa Drain Figure 1
The water samples were obtained using a 5-liter polyethylene sampling bottle, at least, 4 liters of each water sample was used for metals analysis. These were kept in a pre-acid washed and rinsed well with de-ionized water (DIW) polyethylene Jerry-cans
Summary
The Lake Mariut Main Basin (LMMB) is the principle basin for fishing, sometimes is called Proper Lake Mariut. The surface water of Lake Mariut is artificially not allowed to rise more than -2.65 m below sea surface level. This is for the purpose to making it as a sink receiving agricultural and industrial sewage waste effluents from the surrounding lands. The agricultural drainage waters reach the lake from the catchments agricultural lands of Alexandria and Bohaira Provinces via two drains called Qalaa and Umum Drains, respectively. These drains the first one brings the wastewater of the villages and small cities bordering them along their courses, mostly untreated or sometimes primary treated. On the other hand Umum Drain is bordering LMMB at its far west side and a considerable portion of its water feeds LMMB through several breaches made illegally (by fishermen) at its east bank in the part neighboring the southwest side of LMMB. [1,2,3,4,5,6,7,8]
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